ci: add automated tests/linting/format

day_2/.gitignore

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+/target

day_2/Cargo.toml

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+[package]
+name = "day_2"
+version = "1.0.0"
+edition = "2021"
+
+[dependencies]

day_2/README.md

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+# - Day 2 -
+
+Source: <https://adventofcode.com/2023/day/2>
+
+## Instructions - Part 1
+
+## Instructions - Part 2

day_2/src/main.rs

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+fn part_1() -> i32 {
+    142
+}
+
+fn main() {
+    println!("- Day 2: Title -");
+    println!("Answer Part 1: {}", part_1());
+}
+
+#[cfg(test)]
+mod day_2_tests {
+    use super::*;
+
+    #[test]
+    fn test_part_1_example() {
+        assert_eq!(142, part_1());
+    }
+}